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OpenIString, OpenOString
Syntax
OpenIString(S:STRING,T:STRING):DEVICE
OpenOString(S:STRING):DEVICE
Summary
open input or output string
Description
These functions open strings for input or output. The string S
serves as the name of the device opened for input or output; one may
use the empty string.
OpenIString
is used to read input from the
string T with the help of
Get
.
OpenOString
is used to write to a
string with the help of
Print On
.
example
S := "hello world";
D := OpenIString("",S); -- open the string S for input to CoCoA
L:= Get(D,7); -- read 7 characters from the string
L; -- ascii code
[104, 101, 108, 108, 111, 32, 119]
-------------------------------
Ascii(L); -- convert ascii code to characters
hello w
-------------------------------
Close(D); -- close device D
D := OpenOString(""); -- open a string for output from CoCoA
L := [1,2,3]; -- a list
Print L On D; -- print to D
D;
Record[Name = "", Type = "OString", Protocol = "CoCoAL"]
-------------------------------
S := Cast(D,STRING); -- S is the string output to D
S; -- a string
[1, 2, 3]
Print " more characters" On D; -- append to the existing output string
Cast(D,STRING);
[1, 2, 3] more characters
-------------------------------
See Also